Effects of soil lead-arsenic interaction on the transfer of lead and arsenic in peanut
Lead(Pb)and arsenic(As)often coexist in agricultural soils polluted by heavy metals in China.The study on the effect of the interactions between them on their transfer within crop plants has important guiding significance for the safe utilization of heavy metals contaminated farmland.A pot experiment was conducted to ex-amine the enrichment and transfer characteristics of Pb and As in peanut under different Pb(70,120 mg·kg-1)and As(40,100 mg·kg-1)concentration gradient pairwise treatments(CK,Pb70,Pb120,As40,As100,Pb70+As40,Pb70+As100,Pb120+As40,Pb120+As100).The results showed that compared with the single pollution,the co-ex-istence of low concentration of As(As40)had no significant effect on Pb content in different parts of peanut under the low concentration of Pb(Pb70)treatment,and decreased seed Pb content by 17.6%while total Pb accumula-tion amount had no significant change under the high concentration of Pb(Pb120)treatment.The co-existence of high concentration of As(As100)significantly decreased the content of Pb in different plant parts and the total Pb accumulation amount under the two Pb concentrations,and the translocation factors of Pb from roots,shoots and shells to seeds decreased under the combined pollution.The co-presence of Pb70 increased the content of As in peanut shoots by 18.2%,having no significant effects on other parts,and the total As accumulation amount by 18.8%under the As40 treatment,while significantly increased the content of As in all plant parts as well as the total As accumulation amount under the As100 treatment.The co-existence of Pb120 significantly increased the con-tents of As in different plant parts and the total As accumulation amount under both the As concentrations.The translocation factors of As from roots,shoots and shells to seeds were enhanced under combined pollution.Generally speaking,the risk of As exceeding food safety standard was increased and the risk of Pb exceeding food safety stan-dard in peanut seeds was decreased under combined pollution.Soil total Pb and As contents and available Pb and As contents were significantly positively correlated with Pb and As contents and total accumulation amount in pea-nut plants.Soil total As and available As contents were significantly negatively correlated with seed Pb content,and there was no significant relationship between soil total Pb or available Pb content and seed As content.
万方数据
维普
